Exam 7: Cardiac Physiology

A pacemaker potential depends on the increased inward current of calcium ions.

Compare the magnitude of the items in question by using the answer code (options may be used more than once or not at all): a.A is greater than B b.B is greater than A c.A and B are equal **A)resistance and pressure in the pulmonary circulation B)resistance and pressure in the systemic circulation **A)volume of blood pumped out by the left side of the heart B)volume of blood pumped out by the right side of the heart **A)spontaneous rate of depolarization in the SA node B)spontaneous rate of depolarization in the ventricles **A)velocity of impulse through the bundle of His and Purkinje system B)velocity of impulse conduction through the AV node **A)rate of depolarization of the SA node on parasympathetic stimulation B)rate of depolarization of the SA node on sympathetic stimulation **A)duration of systole at resting heart rate B)duration of systole at rapid heart rate during exercise **A)duration of diastole at resting heart rate B)duration of diastole at rapid heart rate during exercise **A)rate of ventricular filling in early diastole B)rate of ventricular filling in late diastole **A)stroke volume when end-diastolic volume equals 130 mL B)stroke volume when end-diastolic volume equals 160 mL **A)normal stroke volume B)stroke volume on sympathetic stimulation **A)volume of blood in the ventricles at the onset of isovolumetric ventricular contraction B)volume of blood in the ventricles at the end of isovolumetric ventricular contraction **A)volume of blood in the left ventricle when the aortic valve opens B)volume of blood in the left ventricle when the aortic valve closes **A)volume of blood in the left ventricle when the left AV valve opens B)volume of blood in the left ventricle when the left AV valve closes **A)duration of the refractory period in cardiac muscle B)duration of contraction in cardiac muscle **A)duration of the refractory period in cardiac muscle B)duration of the refractory period in skeletal muscle **A)coronary blood flow during systole B)coronary blood flow during diastole

The heart undergoes tetanic contraction during sympathetic stimulation to squeeze out more blood.

The ATHS gene has been identified for susceptibility to ____________________.

A condition in which the heart is contracting in an uncontrolled,rapid and irregular manner _______________

The right half of the heart pumps blood through the pulmonary circuit.Through which circuit does the left half pump blood?

____________________ carries cholesterol to cells,whereas ____________________ transports it away from cells.

Parasympathetic stimulation slows the rate of depolarization of the SA node and thus decreases the heart rate.

Sympathetic stimulation of the heart increases calcium permeability.

Ventricular filling occurs more rapidly early in diastole than it does later in diastole.

An increase in cardiac sympathetic activity ____________________ the contractility of the ventricles.

Indicate which pressure relationship exists during the time in question by using the answer code (options may be used more than once or not at all): -during isovolumetric ventricular relaxation

The cardiac output is the same as the cardiac reserve of the heart.

The ____________________ is the normal pacemaker of the heart.

What component of the cardiac conduction system distributes electrical signals through the papillary muscles directly?

Match the cardiovascular feature with the correct characteristic by using the answer code: -abnormal clot attached to a vessel wall

Which of the following occurs at rapid heart rates?

Match the EKG feature with the correct characteristic by using the answer code: -time during which ventricles are filling

What is the term for the volume of blood ejected from each ventricle during a contraction?

An ectopic focus is the place where __________________________